Umbrella



FIG. 1 is a front elevational view of an umbrella showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof;

FIG. 8 is another perspective view thereof;

FIG. 9 is a perspective view with the umbrella being partly removed from the casing;

FIG. 10 is a perspective view with the umbrella being completely removed from the casing; and,

FIG. 11 is a perspective view with the umbrella being opened.

The broken lines shown form no part of the claimed design. 

The ornamental design for an umbrella, as shown and described. 